Answer:
Married filing jointly
Step-by-step explanation:
Since Sophia is a widow and did not remarry during 2020, she can still file as married filing jointly. She can do that for up to two years after her spouse (Aiden) died, as long as she doesn't remarry.
The standard deduction for married filing jointly is $24,800 for 2020, which is much higher than single filers or heads of household.